Help using PIREP FORM:
The FORM for creating custom PIREPs plots requires a few parameters.
You can choose a region of your own simply by entering the latitude
and longitude coordinates of the southwest and northeast corners. You
may also choose what types of PIREPs you are interested in: ICING,
TURBULENCE, WEATHER, or SKY CONDITIONS. In relation to ICING and
TURBULENCE, a minimum and maximum severity may be chosen in order to
neglect plotting of "Negative" reports, or "Light" reports. Lastly, a
time window from 2 to 6 hours of the most recent data may be
specified.

U.S. air carriers are generally the only aircraft to
transmit voice Pilot Reports via National Weather Service
communication circuits. Therefore, there are rarely PIREPs outside of
the continental U.S. and the immediate coastal regions. There are some
Canadian and Alaskan PIREPs but almost no Mexican reports. There are
oceanic AIREPs in the database which include temperature and wind
data. Choose the "Weather" category to see plots of that data over
ocean regions. Otherwise, plots of non-U.S. regions will likely come
up blank. Sorry.